<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择器 -->
          <el-cascader
            expandTrigger="hover"
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <!-- v-model绑定当前显示的页签 @tab-click当页签发生改变时触发 label选项卡标题 name与选项卡对应的标识符 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加动态参数 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" stripe border>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加静态属性 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" stripe border>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加属性、参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form label-width="100px" :model="addForm" :rules="addFormRules" ref="addFormRef">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改属性、参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form label-width="100px" :model="editForm" :rules="editFormRules" ref="editFormRef">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      catelist: [],
      //配置数据
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      activeName: 'many',
      //定义动态参数数据
      manyTableData: [],
      //定义静态属性数据
      onlyTableData: [],
      //添加对话框的隐藏与显示
      addDialogVisible: false,
      //定义添加表单值
      addForm: {
        attr_name: ''
      },
      //添加表单的验证规则
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      //修改对话框的隐藏与显示
      editDialogVisible: false,
      //修改对话框的表单值
      editForm: {
        attr_name: ''
      },
      //修改表单的验证规则
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  created: function() {
    //获取商品分类列表
    this.getCateList()
  },
  methods: {
    getCateList: async function() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败')
      }
      this.catelist = res.data
    },
    //级联选择框发生变化，会触动这个函数
    handleChange: function() {
      this.getParamsData()
    },
    //tab标签的点击处理事件
    handleTabClick: function() {
      // console.log(this.activeName)
      this.getParamsData()
    },
    //获取商品参数列表
    getParamsData: async function() {
      //如选中的不是三级分类，则清空
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return false
      }
      //证明选中的是3级列表
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: {
            sel: this.activeName
          }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }

      //将获取到的参数字符串转变为数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //为了使每行数据不影响其他，所以给每行数据都添加一个隐藏与绑定添加数据
        item.inputVisible = false
        item.inputValue = ''
      })

      //判断是动态参数的数据还是静态属性的数据
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    //监听对话框的关闭，清除表单值
    addDialogClosed: function() {
      this.$refs.addFormRef.resetFields()
    },
    //添加参数
    addParams: async function() {
      const { data: res } = await this.$http.post(
        `categories/${this.cateId}/attributes`,
        {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        }
      )
      console.log(res)

      if (res.meta.status !== 201) {
        return this.$message.error('添加参数失败')
      }
      this.$message.success('添加参数成功')
      this.addDialogVisible = false
      this.getParamsData()
    },
    //展示修改的对话框
    showEditDialog: async function(attrId) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attrId}`,
        {
          params: {
            attr_sel: this.activeName
          }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取修改参数失败')
      }
      // console.log(res.data)

      this.editForm = res.data
      this.editDialogVisible = true
    },
    //当修改对话框关闭后，清空参数
    editDialogClosed: function() {
      this.$refs.editFormRef.resetFields()
    },
    //修改参数
    editParams: function() {
      //验证表单并提交修改
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        console.log(res)
        if (res.meta.status !== 200) {
          return this.$message.error('更新参数失败')
        }

        this.$message.success('更新参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    //删除参数
    removeParams: async function(attrId) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数',
        '提示',
        {
          confirmButtonText: '确定',
          cancleButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attrId}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    //添加tag
    handleInputConfirm: async function(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return false
      }
      //输入了数据
      row.attr_vals.push(row.inputValue.trim()) //添加数据
      this.saveAttrVals(row)
    },
    showInput: function(row) {
      row.inputVisible = true
      //$nextTick方法的作用,就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //将更改的数据保存到数据库
    saveAttrVals: async function(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('更新失败')
      }
      this.$message.success('更新成功')
      row.inputValue = ''
    },
    //删除标签
    handleClose: function(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    //计算属性
    isBtnDisabled: function() {
      //如果选择了三级的商品分类，则打开添加参数、属性按钮，否则禁止
      if (this.selectedCateKeys.length !== 3) {
        return true
      } else {
        return false
      }
    },
    //获取分类id
    cateId: function() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //计算对话框标题
    titleText: function() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 100px;
}
</style>